Pressure-indicator.



PAIENTED SEPT. s, v1908.

A. H. G. GIBSON.

PRESSURE INDICATOR. APPLICATION FILED Nov. 16, 1905.

Hal.

. y.ea'iiiun HUGO o. eiBsoN, or BIRMINGAM, ENGLAND.v

` rREssURE-INDIATOR;

Specification of Letters Patent.

Patented Sept. 8, 1908.

- Application filed November 16, `1905. V Serial No. 287,578.

TovaZZ whom 'itmay concern.'

Be it known that I, ARTHUR HUGO GIB# SON, a subject of the Kingdom of Great Britain, residing atV Bridge street, Birmingham, in the county of Warwick, England, elece tiical engineer, `have invented a certain new and useful Pressure-Indicator, (for which I have obtained Letters Patent in Great Brit-A ain, Patent No. 101, dated January :3, 1905,) of which the following is a specification.

This invention relatesto the class of apparatus and means foreXaininingand-gagiiig the conditions within the cylinders or other parts of mechanisms of any description, which mechanisms are concerned in the utilization or development of pressure ,or in the use of the eXpansive'quali-ties of liquids or gases under pressure, and whereby the pressure oi' variation of'pressure of the liquids or gases in the cylinder .is indicated and can readily and constantly be ascertained in theI ordinary course of the engines work, thus in the case for example of internal combustion engines used for motor cars', enabling the driver oi a car to immediately discover and locate a fault without having t stop the car i and test i"or.it 'in the usual manner. By this invention the use of a bypass in such apparatus is dispensed with and `the return pressure gas from the indicator isexhausted into the external atmosphere, for the purpose of preventing it meeting with the incoming pressure on the cylinder side of the valve.

ln order that this invention may be clearly understood andinore easily carried intofpiae tice, I will proceed to' describe my invention 'y as applied to the cylinders of anV internal combustion engine as used forautomobiles and fro'ni which its more general application will be readily understooi of' my apparatus. Fgl 2 isla irontelevation of the arrangement illustrated by Fig. 1' and which is shown applicable for a two cylinder engine` Like letters of reference refer to like parts throughout the specification an d (,lrawi'rngs.,4 'In carrying out my invention l employ `any suitable pressure gage or gages equalin number of cylinders or pressure containing vessels of the mechanism to be tested. Each pressure gage A is connected to the cylinder Figure 1 is a diagram lsectional elevation tube or pipe C C and suitable unions so that anyl pressure within the vvessel will be communicated to the gage A. interposed be- 'tween'the tubesor pipes C -and C is a teek piece B comprising. a valve body B having,"

an inlet port B connected with the pipe C leading to the cylinder, and, an outlet port C3 connected with the pipe C leading to the gage A. Closing the inlet port is a check' valve F held against its seat byfa counter'- balancing spring'F. The gases pass' through -the inlet port B iroin the cylinder of the eligine to the gage A. Iiithe valve b o'dy B between the check valve F and the gage A is 'an orifice e which may be regula-ted in extent by the screw valve E for the purpose of allowing the gas to escape from the valve.

body to the external atmosphere and prevent the return, and the incon'iing, pressure from meeting on the gage side of the check valve F.

Any pressure J or succession of pressure within the cylinder or pressure containing vessel will be communicated to the gage and the pressure within the gage will then be able to gradually leak awaythrough the orifice e.,

lt willjreadily be seen that if for vexample the four cylinders of an internal combustion engine are connected to four of iny apparatus or pressure containing vessel by means of a then any di'fl'erence of the pressures generated m the several cylinders will .become apparent on the rgage corresponding with that cylinder.

The screw down part'of the valve E may -be so inarkedas to 'enable the screw e2 to bev readily adjusted for the requirced escape of' leakage of the gas.

My invention may bevaried so as to enable A ine to' apply it to.' the various requirements to be niet with, without departingfrom the general principle of my invention.

by Letters Patent is :-A

- ln a pressure indicator the combination of,

`.a gage, a fluid containing chamber. connected with 'the gage, afluid supply pipe for the chamber, a non-return valve for the chamber, and a spring forA the non-return valve oi Vsull'icient strength to Iprevent the passage What l claim as new, and desire to secure of the pressure Huid into-'the fluid chamber* until a predetermined pressure is reached,

with, e lse'cond@hmben a partition between I In Witness whereof have hereunto set my the second chamber and the rst mentioned hand in the presence of two witnesses.

4cham-tuer having an orifice-therein -an adjustj v g .able Valve mounted in the outer ,wall of the' ARTHUR 5- second chamber to regulate the size of the Witnesses:

orifice, and an outletfrom the second. mene WALKER A. E. BARTLAM, tioned chamber to the atmosphere. JUSTUS JONES. 

